<template>
	<view>
		
		<!--这是自定义的搜索组件-->
		<!-- <my-search :bgcolor="'#000000'"></my-search> -->
		<my-search @click="gotoSearch"></my-search>
		
		
		
		<view class="scroll-view-container">
			<!--左侧的滑动区域-->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height : wh + 'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class = "['left-scroll-view-item',i ===active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
				
			</scroll-view>
			<!--右侧的滑动区域-->
			<scroll-view scroll-y="true" :style="{height : wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级分类的标题-->
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<!--当前二级分类下的三级分类列表-->
					<view class="cate-lv3-list">
						<!--三级分类的item项-->
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
						<!--三级分类的图片-->
							<image :src="item3.cat_icon"></image>
							<!--三级分类的文本-->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//当前设备可用的高度
				wh : 0,
				cateList :[],
				active:0,
				//二级分类的列表
				cateLevel2 : [],
				scrollTop: 0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			console.log(sysInfo)
			this.wh = sysInfo.windowHeight - 50
			
			this.getCateList()
		},
		methods:{
			//获取分类列表的数据
			async getCateList() {
				const {data:res} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !==200) return uni.$showMsg()
							this.cateList= res.message
							
				//为二级分类赋值
				this.cateLevel2 = res.message[0].children
				},
				activeChanged(i) {
					this.active = i
					
					// 重新为二级分类赋值
				this.cateLevel2 = this.cateList[i].children
				
				this.scrollTop = this.scrollTop === 0? 1 : 0
				},
				// 跳转到商品列表页面
				gotoGoodsList(item) {
					uni.navigateTo({
						url: '/subpkg/goods_list/goods_list?cid='+item.cat_id
					})
				},
				gotoSearch() {
					uni.navigateTo({
						url: '/subpkg/search/search'
					})
				}
		}
	}
</script>

<style lang="scss">
.scroll-view-container {
	display: flex;
	
	.left-scroll-view {
		width: 120px;
		
		.left-scroll-view-item{
			background-color: #f7f7f7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			
			&.active{
				background-color: #FFFFFF;
				position: relative;
				
				
				&::before {
					content:' ';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #c00000;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}
	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
}

.cate-lv3-list {
	display: flex;
	flex-wrap: wrap;
	
	.cate-lv3-item{
		width: 33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;
		
		image {
			width: 60px;
			height: 60px;
		}
		text {
			font-size: 12px;
		}
	}
}
</style>
